As madscntst said, Chloe Moretz has already had two high profile roles that have gotten her a lot of attention, so much so that she's become one of the most sought after young actresses in the industry. She currently has two films in release, she has three films in post-production (including Martin Scorsese's
Hugo, which is expected to be huge this coming November), she's currently shooting a film, she has two more in pre-production, and about three or four more that are in various stages of development. She's not currently ranked at #52 (which incidentally does put her second only to Depp so far as the DS cast is concerned) on IMDb simply because of a good agent. And she's been getting a lot of press lately because she's either doing it to promote her current films or accepting an award for her past film
Let Me In. The girl is pretty much on fire at the moment. And as madscntst also said, her profile will in all probability be an asset to DS. And her talent isn't likely to hurt the film either.
202 days 12 hours 30 minutes 45 seconds until the day the Depp/Burton Dark Shadows is released(ET)!!